Energy spectrum and mass composition of primary cosmic radiation in the region above the knee from the GAMMA experiment

Details Energy spectrum and mass composition of primary cosmic radiation in the region above the knee from the GAMMA experiment Energy spectrum and mass composition of primary cosmic radiation in the region above the knee from the GAMMA experiment

2011-12-31

arxiv.org/abs/1201.0235v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 8 figures, 32nd International Cosmic Ray Conference, Beijing, 2011

Scientific paper

The energy spectrum of the primary cosmic radiation in the energy range 1 - 100 PeV and the extensive air shower (EAS) characteristics obtained on the basis of the expanded data bank of the GAMMA experiment (Mt. Aragats, Armenia) are presented. With increased statistics we confirm our previous results on the energy spectrum. The spectral index above the knee is about -3.1, but at energies beyond 20 PeV a flattening of the spectrum is observed. The existence of the 'bump' at about 70 PeV is confirmed with a significance of more than 4{\sigma}. In the energy range of 10 - 100 PeV the shower age becomes energy independent and we observe a direct proportionality of the EAS size to the primary energy. This suggests an approximately constant depth of the EAS maximum in this energy range. This is evidence in favour of an increasing average mass of primary particles at energies above 20 PeV. The additional source scenario, which is a possible explanation of the 'bump' in the spectrum, also leads to the conclusion of increasing mass of the primary cosmic rays. A comparison with the data of other experiments is presented.

Affiliated with

Also associated with

No associations

Rating

Energy spectrum and mass composition of primary cosmic radiation in the region above the knee from the GAMMA experiment does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Energy spectrum and mass composition of primary cosmic radiation in the region above the knee from the GAMMA experiment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy spectrum and mass composition of primary cosmic radiation in the region above the knee from the GAMMA experiment will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-672920